personally i'd get the GA-EX58-UD5P (or EXTREME) because i've only had good experiences with Gigabyte boards, and from all the reviews i've seen, this thing should support a really nice base clock (220MHz+)... plus it'll support SLI, which was the main thing that eVGA had before Core i7
the Cryo-Z is a great machine if you overlook the superficial flaws (non-flush cases, minor blemishes in the finish, and some stuff on the inside)... other than that, it;ll perform really well... they're charged with R507, so they should get down to about -50°C (probably around -40 effectively), so they will do as well as just about any single stage out... also, the Cryo-Z is quite cheap when it comes to pre-built single stagers, but, if you know what you're doing, you can build an equal performing unit for less... so i'd say the Cryo-Z is a good option for you Nos, because i know you dont wanna build your own